Spring-tooth for cultivators.



HQF. PETERSON.

SPRING TOOTH FOR CULTIVATORS.

APPLICATION FILED MAY 15. I916.

1,218,581. Patentd M2m6, 1917.

prrrrsn srarns arana series.

HILDING r. PETERSON, or MARSHALLTOWN, IOWA, AssIsNoa TO LIGHT DRAFT HARROW COMPANY, or MAR-SHALLTOWN, IOW'A.

SPRING-TOOTH FOR CULTIVATORS.

Specification of Letters Patent.

Patented Mar. 6, 1917.

Application filed May 15, 1916. Serial No. 97,757.

To all whom it may concern:

,e it known that I, HILDING F. ParnasoN, a citizen of the United States, and resident of Marshalltown, in the county of Marshall and State of Iowa, have invented a certain new and useful Spring-Tooth for Cultivators, of which the following is a specification.

The object of my invention'is to provide a tooth for cultivators with a spring standard.

Still a further object is to provide in such a tooth a standard having coacting parts, whereby the tooth and standard may be detachably and rigidly secured together by the use of a minimum number of detachable parts and with a minimum number of operations.

A further object is to provide such a device in which the least resistance is offered to weeds and dirt at the lower part of the standard where the tooth is attached thereto.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure 1 shows a side elevation of a spring standard and detachable tooth embodying my invention.

Fig. 2 shows a front elevation of the tooth and the lower portion of the standard.

Fig. 3 shows an inverted, sectional view taken on the line 33 of Fig. 1, and

Fig. 4 shows a view similar to that shown in Fig. 3, the tooth shank being omitted, the parts of the standard being illustrated in their positions before the tooth is secured thereto.

In the form of my invention illustrated in the accompanying drawings, I have shown a spring standard which I have indicated by the reference numeral 10 which preferably comprises a flat bar of resilient metal having the upper substantially hori zontal portion A designed to extend horizontally in the machine and having the rearwardly and downwardly curved portion B.

At the lower end of the spring standard,

its side edges are bent rearwardly as shown in the drawings forming a'rearwardly opening channel 11.

My improved spring tooth may have a cultivating or cutting portion of any suitable size or shape and is provided with an upwardly and rearwardly curved portion 13 from the upper end of which extends upwardly, a flat shank 14. The shank 14 is provided at its forward edge, near its lower portlon, with a substantially horizontal shoulder 15. The parts are so arranged that the forward portion of the shank is received in the channel shaped member 11, as shown partlcularly in Figs. 1 and 3, with the .shoulder 15 adjacent to the lower end of the central portion of the channel.

The side walls of the channel 11 and the shank 14 are provided with openings arranged to register with each other when the parts are assembled and to receive the screwthreaded bolt 16, on one endof which is screwed the nut 17.

The channel 11 is so constructed that its walls are inclined rearwardly and away from each other and from the central portion of said channel, as shown in Fig. 4, so as to make it easy to insert the-shank 14.

When the shank 14 is inserted into the channel and the bolt is placed in position, and the nut is screwed on tightly, the sides of the channel 11 are drawn together, until they frictionally engage the sides of the shank 14, as shown in Fig. 3.'

It will be seen that during the ordinary use of the detachable point, the strain or draw will be rearwardly onthe bolt 16, and that this will tend to force the upper part of the shank 14 against the central portion of the channel 11.

The sides of the channel 11 may be made to frlctlonally' grip the sides of the shank 14, so that a large gripping area" is alforded.

On the other hand it is impossible to tilt the cutting portion 12 of the point upwardly and forwardly with relation to the spring standard, on account of the frictional engagement of the channel walls with the shank, and also on account-ofthe fact that the shoulder 15 will engage the lower end of the central portion of the channel and coact with the bolt 16, to prevent such tilting, thus the detachable point is firmly and rigidly secured to the spring standard.

The advantage or" a construction such as that shown herein may be largely seen from the foregoing description.

One important advantage of my device lies in the extreme simplicity of construction and the cheapness with which it can be made. Only two parts are employed, with the exception of the bolt, and nut, and only tom'parts in the entire device.

In ord r to assemble the spring standard andtooth, only three operations are necessary, the insertion of the shank into the channel, the insertion of the bolt and the screwing on of the nut.

It will be noted that at the lower part of the shank where the channel is formed, the parts are comparatively narrow from side to side, so as to reduce the draft due to drawing the point through the soil, and also to afioi'd a comparatively narrow edge on which weeds and the like might gather.

It is obvious that the cutting tool may be of any desired shape, form or size and may be formed integrally with the shank or may be bolted or riveted on the lower end thereof as may be desired.

Another important advantage in the con struction of my device arises from the fact that the members on the sides of the channel 11 are resilient and when the bolt is inserted the shank 14-. fits snugly and is firmly grimped, whereas if the sides of the channel were rigid a tight, smooth accurate fit could not be always obtained.

On account of the resilience of the sides of the channel 11, it will be seen that the nut 17, which is subjected to vibration, and shock during the use of the machine will be firmly engaged by the channel wall, and thereby held against rotation, so that the channel wall serves as a nut lock.

' Some changes may be made in the construction and arrangement of the parts of the device without departing from the essential features and purposes, and it is my intention to cover by the patent sought for under this application any such modified forms of constructionas may be included within the reasonable scope of my claims.

1 claim as my invention 1. In a device of the class described, the combination of a spring standard comprising a flat resilient metal bar having a horizontal portion at one end thereof, a clownwardly curved portion, said latter portion having at its lower end a rearwardly opening channel with a detachable point having a cutting member, and an upwardly extending shank received in said channel, said point being provided with a horizontal shoulder at its for-ward edge, adapted to coact with the central portion of said channel and a bolt extended through the walls of said channel and said shank.

2. In a device of the class described, a spring standard comprising a Hat resilient metal bar having a substantially horizontal portion, and a downwardly curved portion being bent at its lower end to form a rearwardly opening channel, a detachable point having a cutting portion, an upwardly and rearwardly curved portion, and an upwardly extending flat shank at the upper end of said last described portion, said. shank being provided with a horizontal shoulder near the lower portion of its forward edge adapted to coact with the central portion of said channel when the parts are assembled, a bolt extended through the wall of said channel and through said shank, and a nut on said bolt, for holding the forward edge of the shank against the central portion of the channel and for causing the sides of the shank to be frictionally gripped between the walls of the channel.

Des Moines, Iowa, April 24, 1916.

HILDING F. PETERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

